CN104062457A - Automatic sample feeding device for detecting chemical oxygen demand of water quality - Google Patents
Automatic sample feeding device for detecting chemical oxygen demand of water quality Download PDFInfo
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- CN104062457A CN104062457A CN201410323871.7A CN201410323871A CN104062457A CN 104062457 A CN104062457 A CN 104062457A CN 201410323871 A CN201410323871 A CN 201410323871A CN 104062457 A CN104062457 A CN 104062457A
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Abstract
The invention relates to an automatic sample feeding device for detecting a chemical oxygen demand of water quality. The automatic sample feeding device comprises a machine box, a Y-axis movement assembly, an X-axis movement assembly and a sample feeding module. The automatic sample feeding device is characterized in that a clamping groove for fixing a test tube rack is formed in a bottom plate of the machine box; a fixing bracket is arranged on the side face of the machine box; the Y-axis movement assembly is fixedly arranged at the upper end of the fixing bracket of the machine box through a screw; the X-axis movement assembly is fixedly arranged on a Y slide block of the Y-axis movement assembly; the sample feeding module is fixedly arranged at the lower end of the fixing bracket. The automatic sample feeding device adopts a quantitative tube device to realize accurate control of liquid feeding amount; a quantitative tube is matched with a liquid level sensor to be used so that an injection molding pump stops a liquid feeding process when the liquid feeding amount reaches the liquid level sensor; a reagent only exists in the quantitative tube and a pipeline and does not flow into the injection molding pump so that pollution and corrosion to the injection molding pump caused by liquid are avoided. According to the automatic sample feeding device, the liquid feeding amount is increased and the sample feeding of two types of liquid can be realized simultaneously.
Description
Technical field
The present invention relates to a kind of sampling system, relate in particular to a kind of automatic sampling apparatus detecting for water chemical oxygen demand.
Background technology
Along with the concern of people to environmental quality, water quality monitoring has also been subject to the pay attention to day by day of environment department, what the sample introduction of laboratory water chemical oxygen demand detection was at present taked is mostly hand sampling, and operating personnel add required potassium dichromate and concentrated sulphuric acid reagent to carry out subsequent detection in sample; The mode of this hand sampling, because operator's personal error can affect sample size, can not guarantee sample introduction precision, and operation the concentrated sulphuric acid also there is certain danger, hand sampling mode sample injection time is long, work efficiency is lower; At present, although there is the device of various auto injection on market, but these devices are to be mostly used in the fields such as chemical analysis, medicine equipment, the automatic sampling apparatus also not detecting for water chemical oxygen demand laboratory, existing automatic sampling apparatus is all generally micro-sampling, and device do not have corrosion resistance, can not realize the sample introduction to the concentrated sulphuric acid, this laboratory of just having limited current water chemical oxygen demand is detected can only hand sampling.
Summary of the invention
For deficiency of the prior art, the technical matters that quasi-solution of the present invention is determined is, a kind of automatic sampling apparatus detecting for water chemical oxygen demand is provided, this device has simple in structure easy to operate, sample introduction precision is high, the advantage such as reproducible, has effectively overcome the problem that the artificial sample introduction running time length in laboratory, complicated operation, sample introduction precision can not be guaranteed.
The present invention solve the technical problem adopted technical scheme, a kind of automatic sampling apparatus detecting for water chemical oxygen demand is provided, comprise cabinet, Y-axis motion assembly, X-axis motion assembly and sample introduction module, the base plate that it is characterized in that cabinet is provided with the fixedly draw-in groove of test tube rack, cabinet side is provided with fixed support, Y-axis motion assembly is fixed by screws in the support bracket fastened upper end of cabinet, X-axis motion assembly is fixed on the Y slide block of Y-axis motion assembly, and sample introduction module is fixed on support bracket fastened lower end;
Described Y-axis motion assembly comprises Y base plate, left socle, right support, Y-direction stepper motor, Y Timing Belt, two Y synchronous pulleys, Y coupling shaft, Y guide rail, Y slide block, connection bracket and Y limit switches, left socle, right support, Y guide rail and Y limit switch are fixed on described Y base plate, Y-direction stepper motor is fixed on left socle, and be connected and fixed with left side Y synchronous pulley, right Y synchronous pulley is fixed on right support by Y coupling shaft, the left side is connected by Y Timing Belt with the right Y synchronous pulley, and Y slide block and Y Timing Belt are fixed together by connection bracket;
Described X-axis motion assembly comprises X support, X-direction stepper motor, X Timing Belt, two X synchronous pulleys, X coupling shaft, X guide rail, X slide block, web joint and X limit switches, X support is connected by X guide rail with connection bracket, X-direction stepper motor and X limit switch are fixed in connection bracket, and be connected and fixed with left side X synchronous pulley, the right X synchronous pulley is fixed on X support by X coupling shaft, the left side is connected by X Timing Belt with the right X synchronous pulley, and X slide block and X Timing Belt are fixed together by web joint;
Described sample introduction module comprises syringe pump, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, quantity tube, liquid level sensor, three-way connection and two feed tubes, described two feed tubes respectively with the left joint of the 4th solenoid valve, the right connector of the 3rd solenoid valve is connected, the left joint of the right connector of the 4th solenoid valve and the 3rd solenoid valve couples together by three-way connection, three-way connection is fixed on web joint by screw, the top connection of the top connection of the 4th solenoid valve and the 3rd solenoid valve respectively with the left side of the second solenoid valve, right connector is connected, the top connection of the second solenoid valve is connected with quantity tube lower end, described quantity tube upper end is provided with liquid level sensor, and quantity tube upper end is connected with syringe pump by the first solenoid valve,
Described syringe pump comprises: fixed base plate, left support abutment, right support abutment, bearing spider, leading screw, syringe, stepper motor and two syringe limit switches, left support abutment, right support abutment and two syringe limit switches are all fixed on fixed base plate, stepper motor is connected with left support abutment, described syringe is connected across between bearing spider and right support abutment, the piston of syringe is fixed on bearing spider, leading screw one end is connected with left support abutment, and the other end and right support abutment are fixed together.
Compared with prior art, what in the present invention, X-axis motion assembly and Y-axis motion assembly adopted is the kind of drive of Timing Belt, synchronizing wheel, and realizes guiding with guide rail, thereby has reduced motion artifacts, has increased the stationarity of motion, has improved travelling speed; Sample introduction module adopts syringe pump to control, and utilizes liquid level sensor accurately to control sample size, avoids the personal error of hand sampling, has improved sample introduction efficiency simultaneously; Adopt quantity tube device, realized the accurate control of feed liquor amount, being used in conjunction with of quantity tube and liquid level sensor, while making feed liquor amount reach liquid level sensor, syringe pump stops feed liquor process, reagent is only present in quantity tube and pipeline, can not flow in syringe pump, has therefore avoided the pollution corrosion of liquid to syringe pump.The present invention has not only realized increase feed liquor amount, and can realize the sample introduction to two kinds of liquid simultaneously.
Accompanying drawing explanation
Fig. 1 is that the present invention is for the perspective view of a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
Fig. 2 is the X-axis motion assembly 3 of a kind of embodiment of automatic sampling apparatus and the structural representation of Y-axis motion assembly 2 that the present invention detects for water chemical oxygen demand;
Fig. 3 is that the present invention is for the structural representation of the sample introduction module 4 of a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
Fig. 4 is that the present invention is for the structural representation of the syringe pump 41 of a kind of embodiment of automatic sampling apparatus of water chemical oxygen demand detection;
In figure, 1. cabinet, 2.Y axle motion assembly, 3.X axle motion assembly, 4. sample introduction module, 5. fixed support, 6. draw-in groove, 200.Y base plate, 201. left socle, 202. right support, 203.Y is to stepper motor, 204.Y Timing Belt, 205.Y synchronous pulley, 206.Y coupling shaft, 207.Y guide rail, 208.Y slide block, 209. connection bracket, 210.Y limit switch, 301.X support, 302.X is to stepper motor, 303.X Timing Belt, 304.X synchronous pulley, 305.X coupling shaft, 306.X guide rail, 307.X slide block, 308. web joint, 309.X limit switch, 41. syringe pumps, 42. first solenoid valves, 43. quantity tubes, 44. liquid level sensors, 45. three-way connections, 46. feed tubes, 47. second solenoid valves, 48. the 3rd solenoid valves, 49. the 4th solenoid valves, 411. fixed base plate, 412, left support abutment, 413, right support abutment, 414. bearing spider, 415. leading screw, 416. syringe, 417. stepper motor, 418. syringe limit switches.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail:
The automatic sampling apparatus detecting for water chemical oxygen demand of the present invention's design (is called for short device, referring to Fig. 1-4) comprise cabinet 1, Y-axis motion assembly 2, X-axis motion assembly 3, sample introduction module 4, wherein the base plate of cabinet 1 is provided with the fixedly draw-in groove 6 of test tube rack, cabinet side is provided with fixed support 5, Y-axis motion assembly 2 is fixed by screws in the upper end of the fixed support 5 of cabinet, X-axis motion assembly 3 is fixed on the Y slide block 208 of Y-axis motion assembly, and sample introduction module 4 is fixed on the lower end of fixed support 5;
Described Y-axis motion assembly 2 comprises Y base plate 200, left socle 201, right support 202, Y-direction stepper motor 203, Y Timing Belt 204, two Y synchronous pulleys 205, Y coupling shaft 206, Y guide rail 207, Y slide block 208, connection bracket 209 and Y limit switch 210, left socle 201, right support 202, Y guide rail 207 and Y limit switch 210 are fixed on described Y base plate 200, Y-direction stepper motor 203 is fixed on left socle 201, and be connected and fixed with left side Y synchronous pulley 205, right Y synchronous pulley 205 is fixed on right support 202 by Y coupling shaft 206, the left side is connected by Y Timing Belt 204 with the right Y synchronous pulley 205, Y slide block 208 is fixed together by connection bracket 209 with Y Timing Belt 204,
Described X-axis motion assembly 3 comprises X support 301, X-direction stepper motor 302, X Timing Belt 303, two X synchronous pulleys 304, X coupling shaft 305, X guide rail 306, X slide block 307, web joint 308 and X limit switch 309, X support 301 is connected by X guide rail 306 with connection bracket 209, X-direction stepper motor 302 and X limit switch 309 are fixed in connection bracket 209, and be connected and fixed with left side X synchronous pulley 304, the right X synchronous pulley 304 is fixed on X support 301 by X coupling shaft 305, the left side is connected by X Timing Belt 303 with the right X synchronous pulley 304, X slide block 307 is fixed together by web joint 308 with X Timing Belt 303,
Described sample introduction module 4 comprises syringe pump 41, the first solenoid valve 42, the second solenoid valve 47, the 3rd solenoid valve 48, the 4th solenoid valve 49, quantity tube 43, liquid level sensor 44, three-way connection 45 and two feed tubes 46, described two feed tubes 46 respectively with the left joint of the 4th solenoid valve 49, the right connector of the 3rd solenoid valve 48 is connected, the left joint of the right connector of the 4th solenoid valve 49 and the 3rd solenoid valve 48 couples together by three-way connection 45, three-way connection 45 is fixed on web joint 308 by screw, the top connection of the top connection of the 4th solenoid valve 49 and the 3rd solenoid valve 48 respectively with the left side of the second solenoid valve 47, right connector is connected, the top connection of the second solenoid valve 47 is connected with quantity tube 43 lower ends, described quantity tube 43 upper ends are provided with liquid level sensor 44, and quantity tube 43 upper ends are connected with syringe pump 41 by the first solenoid valve 42,
Described syringe pump 41 comprises: fixed base plate 411, left support abutment 412, right support abutment 413, bearing spider 414, leading screw 415, syringe 416, stepper motor 417 and two syringe limit switches 418, left support abutment 412, right support abutment 413 and two syringe limit switches 418 are all fixed on fixed base plate 411, stepper motor 417 is connected with left support abutment 412, described syringe 416 is connected across between bearing spider 414 and right support abutment 413, the piston of syringe 416 is fixed on bearing spider 414, leading screw 415 one end are connected with left support abutment 412, the other end and right support abutment 413 are fixed together.
Apparatus of the present invention are further characterized in that described Y limit switch, X limit switch are mechanical contact-type switch or optoelectronic switch.
Apparatus of the present invention are further characterized in that described the first solenoid valve 42, the second solenoid valve 47, the 3rd solenoid valve 48, the 4th solenoid valve 49 are the three-way solenoid valve of anti-strong acid.
Apparatus of the present invention are further characterized in that described liquid level sensor 44 is ultrasonic sensor.
Apparatus of the present invention are further characterized in that described quantity tube 43 material therefors are teflon or glass.
In the present invention, concrete structure (referring to Fig. 2) and the function of Y-axis motion assembly 2 and X-axis motion assembly 3 are: Y base plate 200 is that left socle 201, right support 202, Y guide rail 207 and Y limit switch 210 are arranged on Y base plate 200 for fixed support Y-axis motion assembly 2.Y-direction stepper motor 203 is fixed on left socle 201, and be fixedly connected with left side Y synchronous pulley 205, by Y Timing Belt 204 and the right Y synchronous pulley 205, link together, the right Y synchronous pulley 205 is fixed on right support 202 by Y coupling shaft 206, and Y slide block 208 is fixed together by connection bracket 209 with Y Timing Belt 204.Y-direction stepper motor 203 drives two Y synchronous pulleys 205 to rotate, thereby drives Y slide block 208 to do rectilinear motion along Y guide rail 207, further drives X-axis motion assembly 3 to move horizontally along X guide rail 306.Connection bracket 209 not only plays the effect that is fixedly connected with slide block 208 and Y Timing Belt 204, also for fixedly X-direction stepper motor 302 and X limit switch 309.
Further, Y base plate 200 is provided with Y limit switch 210, and when Y slide block 208 touches Y limit switch 210, Y-direction stepper motor 203 quits work, and Y slide block 208 and Y limit switch 210 are for realizing the zero-point positioning to Y-axis.
X-axis motion assembly 3 comprises X support 301, X-direction stepper motor 302, X Timing Belt 303, two X synchronous pulleys 304, X coupling shaft 305, X guide rail 306, X slide block 307, web joint 308 and X limit switches 309.Wherein, X-direction stepper motor 302 is fixed in connection bracket 209, and is fixedly connected with left side X synchronous pulley 304.The right X synchronous pulley 304 is fixed on X support 301 by X coupling shaft 305, X support 301 links together by X guide rail 306 with connection bracket 209, X web joint 308 is not only for being fixed together X Timing Belt 303 and X slide block 307, also, for the installation location of three-way connection 45, realize the action to test tube sample introduction.X-direction stepper motor 302 drives two X synchronous pulleys 304 to rotate, thereby drives X slide block 307 along X guide rail 306 moving linearlies, realizes the sample introduction of the to-and-fro movement of three-way connection 45 to different test tubes.
Further, connection bracket 209 is provided with X limit switch 309, when X slide block 307 touches X limit switch 309, and 302 stop motions of X-direction stepper motor, X slide block 307 and X limit switch 309 are for realizing the zero-point positioning to X-axis.
In the present invention, the concrete structure of sample introduction module 4 (referring to Fig. 3) and function are: comprise syringe pump 41, the first solenoid valve 42, quantity tube 43, liquid level sensor 44, three-way connection 45, two feed tubes 46, the second solenoid valve 47, the 3rd solenoid valve 48 and the 4th solenoid valves 49.Syringe pump 41 is connected with quantity tube 43 upper ends by the first solenoid valve 42, liquid level sensor 44 is installed, for realizing the accurate control to feed liquor amount on quantity tube 43.Quantity tube 43 lower ends are connected with the top connection of the second solenoid valve 47, and the left and right joint of the second solenoid valve is connected with the top connection of the 4th solenoid valve 49, the 3rd solenoid valve 48 respectively, the path of switching solenoid valve, thus control the feed liquor of different liquids and discharge opeing.Two feed tubes 46 are connected with the left joint of the 4th solenoid valve 49, the right connector of the 3rd solenoid valve 48 respectively, for completing the process of imbibition.The left joint of the right connector of the 4th solenoid valve 49, the 3rd solenoid valve 48 is connected respectively on two interfaces of three-way connection 45, and another interface of three-way connection 45 is connected with X web joint 308, and then completes the sample introduction process to different test tubes.
Further, the use of liquid level sensor 44 and quantity tube 43, had both guaranteed not liquid body pollution of syringe pump 41, can realize again the accurate control to feed liquor amount.
In the present invention, the concrete structure of syringe pump 41 (referring to Fig. 4) and function are: fixed base plate 411, left support abutment 412, right support abutment 413, bearing spider 414, leading screw 415, syringe 416, stepper motor 417 and two syringe limit switches 418.Left support abutment 412 and right support abutment 413, two syringe pump limit switches 418 are fixedly mounted on fixed base plate 411, stepper motor 417 is fixed on left support abutment 412, leading screw 415 is connected with right support abutment 413 with left support abutment 412 respectively, stepper motor 417 drives leading screw 415 to rotate, thereby driving bearing bearing 414 moving linearlies, the piston of syringe 416 and bearing spider 414 are fixed together, the push-and-pull of the piston of the motion pushing syringe 416 of bearing spider 414, syringe 416 produces negative pressure in push-and-pull process, advances suction and the discharge of liquid in pipeline.
Further, syringe limit switch 418 is controlled respectively the range of syringe push-and-pull.When bearing spider 414 contacts with left side syringe limit switch 418, show that imbibition process reaches maximum range, feed liquor finishes, stepper motor 417 reversions, start discharge opeing process, when bearing spider 414 contacts with the right syringe limit switch 418, show that discharge opeing process finishes.
Apparatus of the present invention are mainly for the sample introduction that detects required two kinds of reagent potassium dichromates and the concentrated sulphuric acid in water chemical oxygen demand, and this device is compared with respect to prior art, and not only feed liquor amount is large, and can realize the sample introduction to two kinds of liquid simultaneously.The sample introduction position of apparatus of the present invention and flow control etc. all complete under computer control.
In the present invention, the base plate of cabinet 1 is provided with the fixedly draw-in groove 6 of test tube rack, is used for realizing the location to test tube rack, thereby realizes the accurate location to the position of 16 test tubes, meanwhile, uses draw-in groove 6 can make operating personnel easily test tube rack be replaced; The present invention can complete successively to 16 sample introduction processes with interior test tube.
What in the present invention, X-axis motion assembly 3 and Y-axis motion assembly 2 adopted is the kind of drive of Timing Belt, synchronizing wheel, and realizes guiding with guide rail, thereby has reduced motion artifacts, has increased the stationarity of motion, has improved travelling speed; Sample introduction module 4 adopts syringe pump 41 to control, and utilizes 44 pairs of sample sizes of liquid level sensor accurately to control, and avoids the personal error of hand sampling, has improved sample introduction efficiency simultaneously; Adopt quantity tube 43 to realize the accurate control of feed liquor amount, quantity tube 43 is used in conjunction with liquid level sensor 44, while making feed liquor amount reach liquid level sensor 44, syringe pump 41 stops feed liquor process, reagent is only present in quantity tube and pipeline, can not flow in syringe pump, therefore avoid the pollution corrosion of liquid to syringe pump.The quantity tube 43 that the present invention adopts teflon or glass to make, and all pipelines of device all adopt the polyfluortetraethylene pipe as link, and then guaranteed acid resistance and the corrosion resistance of device.
Embodiment 1
The automatic sampling apparatus detecting for water chemical oxygen demand in the present embodiment can be realized two-way feed liquor, mainly for detect two kinds of required reagent in water chemical oxygen demand: potassium dichromate and the concentrated sulphuric acid.After device powers on, 1～16 different sample introduction test tube quantity can be set, the rear needs that detect according to reality be set, successively to each test tube sample introduction 10ml potassium dichromate and the 30ml concentrated sulphuric acid.This device can be at 19 minutes with the interior sample introduction that completes 16 test tubes, and sample introduction error is less than 1ml, and sample introduction precision is in 2.5%.
Claims (5)
1. the automatic sampling apparatus detecting for water chemical oxygen demand, comprise cabinet, Y-axis motion assembly, X-axis motion assembly and sample introduction module, the base plate that it is characterized in that cabinet is provided with the fixedly draw-in groove of test tube rack, cabinet side is provided with fixed support, Y-axis motion assembly is fixed by screws in the support bracket fastened upper end of cabinet, X-axis motion assembly is fixed on the Y slide block of Y-axis motion assembly, and sample introduction module is fixed on support bracket fastened lower end;
Described Y-axis motion assembly comprises Y base plate, left socle, right support, Y-direction stepper motor, Y Timing Belt, two Y synchronous pulleys, Y coupling shaft, Y guide rail, Y slide block, connection bracket and Y limit switches, left socle, right support, Y guide rail and Y limit switch are fixed on described Y base plate, Y-direction stepper motor is fixed on left socle, and be connected and fixed with left side Y synchronous pulley, right Y synchronous pulley is fixed on right support by Y coupling shaft, the left side is connected by Y Timing Belt with the right Y synchronous pulley, and Y slide block and Y Timing Belt are fixed together by connection bracket;
Described X-axis motion assembly comprises X support, X-direction stepper motor, X Timing Belt, two X synchronous pulleys, X coupling shaft, X guide rail, X slide block, web joint and X limit switches, X support is connected by X guide rail with connection bracket, X-direction stepper motor and X limit switch are fixed in connection bracket, and be connected and fixed with left side X synchronous pulley, the right X synchronous pulley is fixed on X support by X coupling shaft, the left side is connected by X Timing Belt with the right X synchronous pulley, and X slide block and X Timing Belt are fixed together by web joint;
Described sample introduction module comprises syringe pump, the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve, quantity tube, liquid level sensor, three-way connection and two feed tubes, described two feed tubes respectively with the left joint of the 4th solenoid valve, the right connector of the 3rd solenoid valve is connected, the left joint of the right connector of the 4th solenoid valve and the 3rd solenoid valve couples together by three-way connection, three-way connection is fixed on web joint by screw, the top connection of the top connection of the 4th solenoid valve and the 3rd solenoid valve respectively with the left side of the second solenoid valve, right connector is connected, the top connection of the second solenoid valve is connected with quantity tube lower end, described quantity tube upper end is provided with liquid level sensor, and quantity tube upper end is connected with syringe pump by the first solenoid valve,
Described syringe pump comprises: fixed base plate, left support abutment, right support abutment, bearing spider, leading screw, syringe, stepper motor and two syringe limit switches, left support abutment, right support abutment and two syringe limit switches are all fixed on fixed base plate, stepper motor is connected with left support abutment, described syringe is connected across between bearing spider and right support abutment, the piston of syringe is fixed on bearing spider, leading screw one end is connected with left support abutment, and the other end and right support abutment are fixed together.
2. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described Y limit switch, X limit switch are mechanical contact-type switch or optoelectronic switch.
3. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described the first solenoid valve, the second solenoid valve, the 3rd solenoid valve, the 4th solenoid valve are the three-way solenoid valve of anti-strong acid.
4. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described liquid level sensor is ultrasonic sensor.
5. the automatic sampling apparatus detecting for water chemical oxygen demand according to claim 1, is characterized in that described quantity tube material therefor is teflon or glass.
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| CN201410323871.7A CN104062457B (en) | 2014-07-08 | 2014-07-08 | A kind of automatic sampling apparatus detected for water chemical oxygen demand |
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| CN201410323871.7A CN104062457B (en) | 2014-07-08 | 2014-07-08 | A kind of automatic sampling apparatus detected for water chemical oxygen demand |
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| CN104062457B CN104062457B (en) | 2015-08-05 |
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| CN106976719A (en) * | 2017-05-03 | 2017-07-25 | 杭州博欣科技有限公司 | One kind grips test tube with three shaft mechanical pick-and-place hands |
| CN109030712A (en) * | 2018-08-09 | 2018-12-18 | 合肥学院 | Full-automatic water quality titrates vision inspection apparatus and detection method |
| CN109580518A (en) * | 2019-01-31 | 2019-04-05 | 江西炼石环保科技有限公司 | A kind of greasy dirt cleaning solution saturation degree monitoring device |
| CN110824129A (en) * | 2019-11-13 | 2020-02-21 | 佛山科学技术学院 | Water sample detection device based on activity evaluation of catalyst |
| CN111220599A (en) * | 2018-11-24 | 2020-06-02 | 朱燕超 | Sampling device and sampling method for water quality detection |
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| CN110824129A (en) * | 2019-11-13 | 2020-02-21 | 佛山科学技术学院 | Water sample detection device based on activity evaluation of catalyst |
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|---|---|
| CN104062457B (en) | 2015-08-05 |
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